Adaptive Service Selection - A Fuzzy-valued Matchmaking Approach

Bacciu, Davide and Buscemi, Maria Grazia and Mkrtchyan, Lusine (2009) Adaptive Service Selection - A Fuzzy-valued Matchmaking Approach. Technical Report del Dipartimento di Informatica . Università di Pisa, Pisa, IT.

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Abstract

Service composition concerns both integration of heterogeneous distributed applications and dynamic selection of services. QoS-aware selection enables a service requester with certain QoS requirements to classify services according to their QoS guarantees. In this paper we present a method that allows for a fuzzy-valued description of QoS parameters. Fuzzy sets are suited to specify both the QoS preferences raised by a service requester such as `response time must be as lower as possible and cannot be more that 1000ms' and approximate estimates a provider can make on the QoS capabilities of its services like `availability is roughly between 95% and 99%'. We propose a matchmaking procedure based on a fuzzy-valued similarity measure that, given the specifications of QoS parameters of the requester and the providers, selects the most appropriate service among several functionally-equivalent ones, using a fuzzy ordering relation. We also devise a method for dynamical update of service offers by means of runtime monitoring of the actual QoS performance.

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